Bug 1443360 (CVE-2017-3329)

Summary:	CVE-2017-3329 mysql: Server: Thread Pooling unspecified vulnerability (CPU Apr 2017)
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	aortega, apevec, ayoung, chrisw, cvsbot-xmlrpc, databases-maint, dciabrin, hhorak, jjoyce, jorton, jschluet, jshepherd, jstanek, kbasil, lhh, lpeer, markmc, mbayer, mburns, mmuzila, mschorm, praiskup, rbryant, sclewis, slinaber, srevivo, tdecacqu
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	mysql 5.5.55, mysql 5.6.36, mysql 5.7.18	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-04-20 14:16:38 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	1443389

Description Adam Mariš 2017-04-19 07:18:18 UTC

Vulnerability in the MySQL Server component of Oracle MySQL (subcomponent: Server: Thread Pooling). Supported versions that are affected are 5.5.54 and earlier, 5.6.35 and earlier and 5.7.17 and earlier. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. 

External References:

http://www.oracle.com/technetwork/security-advisory/cpuapr2017-3236618.html#AppendixMSQL

Comment 1 Adam Mariš 2017-04-19 08:12:53 UTC

Created mariadb tracking bugs for this issue:

Affects: fedora-all [bug 1443408]

Comment 2 Adam Mariš 2017-04-19 08:13:08 UTC

Created community-mysql tracking bugs for this issue:

Affects: fedora-all [bug 1443407]

Comment 3 Tomas Hoger 2017-04-20 14:16:38 UTC

MySQL Enterprise Thread Pool is a feature of the MySQL Enterprise Edition, so this CVE is not applicable to the community MySQL version or MariaDB.

https://dev.mysql.com/doc/refman/5.7/en/mysql-enterprise-thread-pool.html

This CVE is most likely related to this entry in the MySQL release notes:

  Thread Pool Notes

  To improve thread_pool plugin performance, connection authentication and
  initialization have been moved from the acceptor thread to the thread pool
  worker threads that handle client connections. This enables the acceptor
  thread to handle new connections at a higher rate with reduced latency. The
  INFORMATION_SCHEMA TP_THREAD_GROUP_STATE table now contains a
  CONNECT_THREAD_COUNT column that indicates the number of threads that are
  processing or waiting to process connection initialization and
  authentication. There can be a maximum of four connection threads per
  thread group; these threads expire after a period of inactivity.
  (Bug #17159742)

https://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-18.html#mysqld-5-7-18-thread-pool
https://dev.mysql.com/doc/relnotes/mysql/5.6/en/news-5-6-36.html#mysqld-5-6-36-thread-pool
https://dev.mysql.com/doc/relnotes/mysql/5.5/en/news-5-5-55.html#mysqld-5-5-55-thread-pool

This change apparently aims to prevent exhausting all threads by an unauthenticated connections.